$\frac{1}{sec\theta\:\:-\:1}\:-\:\frac{1}{sec\theta\:\:+\:1}$

$7^2.76$

$7m+30\:=-12$

$\int\left(\frac{2x-4}{\sqrt{2-x-x^2}}\right)dx$

$\int\left(\frac{11x^2}{\left(144+x^2\right)^2}\right)dx$

$\left(\frac{3b^2}{4}-\frac{6x^3}{5}\right)\left(\frac{6b^3}{5}+\frac{3x^3}{4}\right)$

$20x^2-10b^2-30c^2$